[An analysis of stallion fertility based on the number of matings per heat].
The fertility problems were studied in the herd of the English Thoroughbred horse on the Napajedla stud farm. Breeding records for the period from 1880 to 1972 were used as the starting data. The survey comprised 32 stallions. The relationship between fertility and the number of matings was calculated by the chi 2 quantity. The calculated values are highly variable. However, it is generally seen in most of the stallions that the number of matings per heat (i. e. one or several matings) had no significant influence on the pregnancy of mares and on the fertility values of the stallions. A higher variability among the stallions was found both in fertility and in the number of abortions. The evaluation of pregnancy in mares for the period from 1880 to 1972 indicates that its level was significantly higher before World War I than in the post-war period. The results are interpreted in the discussion.
D000034:Abortion, Veterinary / Q000453:epidemiology; D000818:Animals; D001947:Breeding; D003307:Copulation; D004971:Estrus; D005260:Female; D005298:Fertility; D006736:Horses / Q000502:physiology*; D008297:Male; D011247:Pregnancy
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